Drill tip angle:
The drill tip angle of 118° may be the most common in processing, and is usually used to process soft metals such as low-carbon steel and aluminum. This angle design usually does not have a self-centric function, which means that it is inevitable to process the centering hole first. The 135° drill tip angle usually has a self-centric function. Since there is no need to process the centring holes, this will make drilling the centring hole alone no longer a necessary process, thus saving a lot of time.
For most materials, the spiral angle of 30° is a very good choice. However, for environments that require better chip removal and higher cutting edge strength, you can choose a drill bit with a smaller spiral angle. For materials that are difficult to process, such as stainless steel, you can choose a design with a larger spiral angle to transfer torque.
